The code lives in libblockdev. However, what was your kernel and kmod-kvdo rpm package version please?

Hi

kmod-kvdo-8.1.0.316-2.el9.x86_64
vdo-8.1.0.316-1.el9.x86_64

5.14.0-0.rc4.35.el9.x86_64
RHEL-9.0.0-20210816.2 


[root@storageqe-58 udisks-2.9.2]# python3 src/tests/dbus-tests/run_tests.py -s test_20_LVM.UdisksLVMVDOTest.test_create 
Configuration restored from src/tests/dbus-tests/targetcli_config.json
Not spawning own process: testing the system installed instance.
test_create (test_20_LVM.UdisksLVMVDOTest) ... ERROR

======================================================================
ERROR: test_create (test_20_LVM.UdisksLVMVDOTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/rpmbuild/BUILD/udisks-2.9.2/src/tests/dbus-tests/test_20_LVM.py", line 508, in test_create
    stats = lv.GetStatistics(self.no_options, dbus_interface=self.iface_prefix + '.VDOVolume')
  File "/usr/lib64/python3.9/site-packages/dbus/proxies.py", line 141, in __call__
    return self._connection.call_blocking(self._named_service,
  File "/root/rpmbuild/BUILD/udisks-2.9.2/src/tests/dbus-tests/udiskstestcase.py", line 41, in call_long
    return call(*args, **kwargs)
  File "/usr/lib64/python3.9/site-packages/dbus/connection.py", line 652, in call_blocking
    reply_message = self.send_message_with_reply_and_block(
dbus.exceptions.DBusException: org.freedesktop.UDisks2.Error.Failed: Error retrieving volume statistics: Error reading statistics from /sys/kvdo/udisks_test_vdo_vg-udisks_test_vdopool-vpool/statistics: Error opening directory “/sys/kvdo/udisks_test_vdo_vg-udisks_test_vdopool-vpool/statistics”: No such file or directory

----------------------------------------------------------------------
Ran 1 test in 3.965s

FAILED (errors=1)
All configuration cleared
[root@storageqe-58 udisks-2.9.2]#

VDO changed its sysfs API, we are reading the VDO pool stats from /sys/kvdo/<device>/statistics right now, with (K)VDO version 8 this is no longer available and we need to use /sys/block/<device>/vdo/statistics.

Libblockdev tests are also failing on this so it's not necessary to use UDisks test suite for testing. UDisks is currently only user of this API so I don't think this is severe enough for a 9-Beta exception and we can move this bug to 9.0.0. UDisks can skip the test if needed.

-----

$ sudo python3 tests/run_tests.py -i lvm_test.LVMVDOTest.test_stats
test_stats (lvm_test.LVMVDOTest) ... ERROR

======================================================================
ERROR: test_stats (lvm_test.LVMVDOTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/vtrefny/libblockdev/tests/lvm_test.py", line 1878, in test_stats
    vdo_stats = BlockDev.lvm_vdo_get_stats("testVDOVG", "vdoPool")
gi.repository.GLib.GError: g-file-error-quark: Error reading statistics from /sys/kvdo/testVDOVG-vdoPool-vpool/statistics: Error opening directory “/sys/kvdo/testVDOVG-vdoPool-vpool/statistics”: No such file or directory (4)

----------------------------------------------------------------------
Ran 1 test in 2.846s

FAILED (errors=1)

upstream PR: https://github.com/storaged-project/libblockdev/pull/659

This fixes the libblockdev part, the tests will still fail, we also use LVM to get some of the statistics and LVM also uses /sys/kvdo (see the linked bug for more details).

Hi,

[root@storageqe-69 libblockdev-2.25]# python3 tests/run_tests.py  lvm_test.LVMVDOTest.test_stats
/root/rpmbuild/BUILD/libblockdev-2.25/tests/lvm_test.py:13: PyGIWarning: BlockDev was imported without specifying a version first. Use gi.require_version('BlockDev', '2.0') before import to ensure that the right version gets loaded.
  from gi.repository import BlockDev, GLib
skipped 'VDO kernel module not available, skipping.'

----------------------------------------------------------------------
Ran 0 tests in 0.000s

OK (skipped=1)
[root@storageqe-69 libblockdev-2.25]# modprobe kvdo
modprobe: FATAL: Module kvdo not found in directory /lib/modules/5.14.0-24.el9.x86_64
[root@storageqe-69 libblockdev-2.25]# 

the vdo kernel module is not actively, but the case still try to load vdo kernel module, Is it expected ?

I tested this with the latest compose RHEL-9.0.0-20211208.3 and the VDO module works there:

# rpm -qq kmod-kvdo
kmod-kvdo-8.1.0.316-6.el9.x86_64
# uname -r
5.14.0-26.el9.x86_64

Generally if the kernel you are currently running isn't compatible with the installed version of kmod-kvdo, running "weak-modules --add-kernel --no-initramfs" should also help.

Hi,

After install last compose, the fixed package works well.

vdo-8.1.0.316-1.el9.1.x86_64
kmod-kvdo-8.1.0.316-6.el9.x86_64
libblockdev-2.25-10.el9.x86_64



[root@storageqe-70 libblockdev-2.25]# python3 tests/run_tests.py  lvm_test.LVMVDOTest
/root/rpmbuild/BUILD/libblockdev-2.25/tests/lvm_test.py:13: PyGIWarning: BlockDev was imported without specifying a version first. Use gi.require_version('BlockDev', '2.0') before import to ensure that the right version gets loaded.
  from gi.repository import BlockDev, GLib
test_enabla_disable_compression (lvm_test.LVMVDOTest) ... ok
test_enable_disable_deduplication (lvm_test.LVMVDOTest) ... ok
test_resize (lvm_test.LVMVDOTest) ... ok
test_stats (lvm_test.LVMVDOTest) ... ok
test_vdo_pool_convert (lvm_test.LVMVDOTest) ... ok
test_vdo_pool_create (lvm_test.LVMVDOTest) ... ok
test_vdo_pool_create_options (lvm_test.LVMVDOTest) ... ok

----------------------------------------------------------------------
Ran 7 tests in 22.181s

OK
[root@storageqe-70 libblockdev-2.25]#

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: libblockdev), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:2503